This Whistler beta is the now infamous AXP64 checked build version, transformed into an installable CD-ROM image.
Obviously, this needs a DEC Alpha.
It's been tested on several different Alphas. Note that it is not a release build, so it runs slower than normal. And it is incompatible with 32bit Dec Alpha binaries greatly limiting its usefulness.
Unless you have a kernel debugger connected add the /NODEBUG flag to the bootloader to slightly improve performance.